505217 has 4 divisors (see below), whose sum is σ = 513840. Its totient is φ = 496596.

The previous prime is 505213. The next prime is 505231. The reversal of 505217 is 712505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712505 = 5 ⋅142501.

It is a cyclic number.

It is not a de Polignac number, because 505217 - 2² = 505213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4223 + ... + 4340.

It is an arithmetic number, because the mean of its divisors is an integer number (128460).

2⁵⁰⁵²¹⁷ is an apocalyptic number.

It is an amenable number.

505217 is a deficient number, since it is larger than the sum of its proper divisors (8623).

505217 is an equidigital number, since it uses as much as digits as its factorization.

505217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 505217 is about 710.7861844465. The cubic root of 505217 is about 79.6451470697.

The spelling of 505217 in words is "five hundred five thousand, two hundred seventeen".